change progress bar display rate to 5s to reduce 'spamminess' (#6640)
change progress bar display rate to 5s to reduce 'spamminess' (#6640)

#6625
mitchellh/packer,timsutton/packer,tas50/packer,paulmey/packer,mitchellh/packer,youhong316/packer,bryson/packer,tb3088/packer,mkuzmin/packer,timsutton/packer,mitchellh/packer,grubernaut/packer,hashicorp/packer,mkuzmin/packer,tb3088/packer,ricardclau/packer,paulmey/packer,youhong316/packer,hashicorp/packer,rnaveiras/packer,ricardclau/packer,mitchellh/packer,rnaveiras/packer,rnaveiras/packer,pecigonzalo/packer,tas50/packer,pecigonzalo/packer,grubernaut/packer,ricardclau/packer,tas50/packer,youhong316/packer,bryson/packer,paulmey/packer,dave2/packer,dave2/packer,tb3088/packer,timsutton/packer,bryson/packer,mitchellh/packer,paulmey/packer,mkuzmin/packer,youhong316/packer,ricardclau/packer,rnaveiras/packer,rnaveiras/packer,bryson/packer,grubernaut/packer,tas50/packer,timsutton/packer,youhong316/packer,tas50/packer,tb3088/packer,hashicorp/packer,youhong316/packer,bryson/packer,tb3088/packer,paulmey/packer,mkuzmin/packer,hashicorp/packer,timsutton/packer,grubernaut/packer,rnaveiras/packer,grubernaut/packer,mkuzmin/packer,tb3088/packer,bryson/packer,dave2/packer,ricardclau/packer,dave2/packer,paulmey/packer,mkuzmin/packer,grubernaut/packer,dave2/packer,dave2/packer,tas50/packer,ricardclau/packer,pecigonzalo/packer,timsutton/packer,pecigonzalo/packer